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head/sys/netinet/tcp_timewait.c
| Show First 20 Lines • Show All 701 Lines • ▼ Show 20 Lines | for (;;) { | ||||
| } | } | ||||
| KASSERT(tw->tw_inpcb != NULL, ("%s: tw->tw_inpcb == NULL", | KASSERT(tw->tw_inpcb != NULL, ("%s: tw->tw_inpcb == NULL", | ||||
| __func__)); | __func__)); | ||||
| inp = tw->tw_inpcb; | inp = tw->tw_inpcb; | ||||
| in_pcbref(inp); | in_pcbref(inp); | ||||
| TW_RUNLOCK(V_tw_lock); | TW_RUNLOCK(V_tw_lock); | ||||
| if (INP_INFO_TRY_RLOCK(&V_tcbinfo)) { | INP_INFO_RLOCK(&V_tcbinfo); | ||||
| INP_WLOCK(inp); | INP_WLOCK(inp); | ||||
| tw = intotw(inp); | tw = intotw(inp); | ||||
| if (in_pcbrele_wlocked(inp)) { | if (in_pcbrele_wlocked(inp)) { | ||||
| if (__predict_true(tw == NULL)) { | if (__predict_true(tw == NULL)) { | ||||
| INP_INFO_RUNLOCK(&V_tcbinfo); | INP_INFO_RUNLOCK(&V_tcbinfo); | ||||
| continue; | continue; | ||||
| } else { | } else { | ||||
| /* This should not happen as in TIMEWAIT | /* This should not happen as in TIMEWAIT | ||||
| * state the inp should not be destroyed | * state the inp should not be destroyed | ||||
| * before its tcptw. If INVARIANTS is | * before its tcptw. If INVARIANTS is | ||||
| * defined panic. | * defined panic. | ||||
| */ | */ | ||||
| #ifdef INVARIANTS | #ifdef INVARIANTS | ||||
| panic("%s: Panic before an infinite " | panic("%s: Panic before an infinite " | ||||
| "loop: INP_TIMEWAIT && (INP_FREED " | "loop: INP_TIMEWAIT && (INP_FREED " | ||||
| "|| inp last reference) && tw != " | "|| inp last reference) && tw != " | ||||
| "NULL", __func__); | "NULL", __func__); | ||||
| #else | #else | ||||
| log(LOG_ERR, "%s: Avoid an infinite " | log(LOG_ERR, "%s: Avoid an infinite " | ||||
| "loop: INP_TIMEWAIT && (INP_FREED " | "loop: INP_TIMEWAIT && (INP_FREED " | ||||
| "|| inp last reference) && tw != " | "|| inp last reference) && tw != " | ||||
| "NULL", __func__); | "NULL", __func__); | ||||
| #endif | #endif | ||||
| INP_INFO_RUNLOCK(&V_tcbinfo); | INP_INFO_RUNLOCK(&V_tcbinfo); | ||||
| break; | break; | ||||
| } | } | ||||
| } | } | ||||
| if (tw == NULL) { | if (tw == NULL) { | ||||
| /* tcp_twclose() has already been called */ | /* tcp_twclose() has already been called */ | ||||
| INP_WUNLOCK(inp); | INP_WUNLOCK(inp); | ||||
| INP_INFO_RUNLOCK(&V_tcbinfo); | INP_INFO_RUNLOCK(&V_tcbinfo); | ||||
| continue; | continue; | ||||
| } | } | ||||
| tcp_twclose(tw, reuse); | tcp_twclose(tw, reuse); | ||||
| INP_INFO_RUNLOCK(&V_tcbinfo); | INP_INFO_RUNLOCK(&V_tcbinfo); | ||||
| if (reuse) | if (reuse) | ||||
| return tw; | return tw; | ||||
| } else { | |||||
| /* INP_INFO lock is busy, continue later. */ | |||||
| INP_WLOCK(inp); | |||||
| if (!in_pcbrele_wlocked(inp)) | |||||
| INP_WUNLOCK(inp); | |||||
| break; | |||||
| } | |||||
| } | } | ||||
| return NULL; | return NULL; | ||||
| } | } | ||||